Technology And Computer|

Boot loaders such as GRUB (Grand Unified Bootloader), LILO (Linux Loader) etc. enable you to select to boot a particular operating system in multiboot or dual boot systems. After selecting the operating system (for example Linux), the booting process initially starts with the booting of Linux Kernel program. A Linux Kernel program is the central component of a computer operating system. It requires the corresponding drivers to access the device on which the file system is based. To avoid any conflict due to all imaginable drivers in the kernel, it uses initial ramdisk (intrd). The intrd is the temporary file system, which is mostly used for preparations before the real root file system can be mounted. Problems might occur when intrd gets loaded before Linux Kernel program. In such situations, the hard drive volume becomes un-mountable and the data saved in the hard drive becomes inaccessible. In such situations, you need to recover your data from the latest backup. In case, no backup is available or the backup is corrupted, you need to use efficient Linux Data Recovery applications to recover your lost data files.

Consider a practical example, when you attempt to boot Linux operating system, you encounter the below error message:

“Must load Linux kernel before initrd”

The above error message occurs each time you try to boot the Linux operating system on your computer. After the above error message appears, the data saved in the Linux volume becomes inaccessible.

Cause:

The above error message mainly occurs when the intrd gets loaded before the Linux Kernel program.

Resolution:

To resolve the above error and access the data, you need to remove the intrd from your computer. However, if you still encounter an error, then only option left is to access the volume by reinstalling the Linux operating system. A clean reinstall of the operating system will erase all previously stored data in the hard drive. In such scenarios, you need to recover lost data by using effective Linux Data Recovery software. These advanced recovery applications incorporate high-end scanning methods to recover lost data from a logically corrupted hard drive.

Stellar Phoenix Linux Data Recovery serves the purpose of providing reliable and easy Linux Data Recovery. This read only Linux Recovery software supports Ext2, Ext3 and ReiserFS file systems. It gets installed on Windows (Vista, XP, 2003 and 2000) and the affected Linux drive should be connected as slave.

The final step of Linux boot process is init process, which starts a system process defined in /etc/ initab file. init config file then directs the init process and the shell script /etc/rc.d/rc.sysinit runs. Linux distros put some startup scripts in rc subdirectories, particularly at /etc/rc.d to take control of the services required to be started at boot. But sometimes, you find errors while this process and your system fails to boot. In such situations, you might need to reformat and reinstall the system. Consequently, you require your recent data backup to restore missing information. But if backup exists in unclean state or is currently not present, use of Linux Data Recovery applications can get your lost data back.

You might receive the similar error message while trying to boot your Linux based system:

“/etc/init.d/rc exited outside the expected code flow.

init:rcS main process <number> terminated with status <status>”

You cannot boot the system after this error message.

Cause

Init scripts are located at /etc/init.d/ directory. The above error message occurs if these scripts fail to load and start. It might occur if some of the init.d scripts are corrupted or damaged. As a result, services don’t start and your system fails to boot.

Solution

To solve the existing issue, you should try any of these methods:

• You can boot the system using Live CD and recreate the damaged files using gedit. gedit is the text editor developed for GNOME desktop environment. It is a UTF-8 compatible text editor.

• Try booting the system with Live CD and replacing the damaged script file

• If the above measures fail to correct the problem, you should reformat and reinstall the operating system. After this, you need to use your recent data backup to restore lost information.

While restoring data from backup, if you find any errors or it proves to be incomplete, you should use Linux Recovery applications. These are advanced tools built with indigenous technology to locate the missing information on disk and finally restore it. You find such Linux Data Recovery products with graphically rich user interface.

Stellar Phoenix Linux Data Recovery is an advanced tool to recover lost data from Ext2, Ext3 and ReiserFS based drives. It is a read-only application with high-end scanning algorithms and self-descriptive interface. It supports safe Data Recovery Linux for all of the Linux distributions like SUSE, Gentoo, Mandrake, Debian and more.

Incoming search terms for the article:

• error: /etc/init d/rc exited outside the expected code flow (1)

Root device refers to the device from which a Linux system boots from. While booting if you are getting errors that system cannot access or open the root device, you might need to install a fresh copy of operating system. Thus, you are always suggested to maintain a good data backup of all valuable information you have stored. In such situations, you probably loose data and if backup fails to restore, you will need to use Linux Data Recovery software to scan and restore the data.

You might receive the similar error message while attempting to boot your system:

“Cannot open root device “nnn” or unknown-block(maj,min)

Please append a correct “root=” boot option”

Where, ‘nnn’ represents the name of device and ‘maj,min’ is the address value of block. You cannot boot your system after you receive this error message.

Cause

Some of the possible reasons for this error message to occur are:

• Incorrect entry in grub.conf file

• Incorrectly configured kernel

• SCSI controller or IDE chipset support is either not compiled or is compiled as a module instead of initrd

• File system support is either not compiled or is compiled as a module instead of initrd

• If you have recently installed the system, then the odds are that you haven’t edited /etc/fstab file while installing. fstab is the file referenced by Linux to determine available disks and disk partitions and is most commonly used by mount command.

Solution

To solve such issues, you need to boot your affected system using Linux Live CD and check and reset the faulty parameters that are preventing your Linux system from booting. If this doesn’t help, you should reformat and reinstall the system as the last resort. You can then restore your lost data from the most recent data backup you have. But backup availability is not must in each case. In such situations, you are recommended to use Linux Recovery software.

Linux Data Recovery applications are advanced applications that are specifically designed to scan a logically crashed drive. After a thorough scan, they restore lost data at a safe location, without harming actual data.

Stellar Phoenix Linux Data Recovery is a powerful Data Recovery Linux software that supports Ext2, Ext3 and ReiserFS file systems. It is a non-destructive tool with rich user interface and advanced recovery abilities. It natively supports all Linux distributions like Red Hat, Turbo Linux, SlackWare, Caldera, Sorcerer, SUSE etc.

Root device refers to the device from which a Linux system boots from. While booting if you are getting errors that system cannot access or open the root device, you might need to install a fresh copy of operating system. Thus, you are always suggested to maintain a good data backup of all valuable information you have stored. In such situations, you probably loose data and if backup fails to restore, you will need to use Linux Data Recovery software to scan and restore the data.

You might receive the similar error message while attempting to boot your system:

“Cannot open root device “nnn” or unknown-block(maj,min)

Please append a correct “root=” boot option”

Where, ‘nnn’ represents the name of device and ‘maj,min’ is the address value of block. You cannot boot your system after you receive this error message.

Cause

Some of the possible reasons for this error message to occur are:

• Incorrect entry in grub.conf file

• Incorrectly configured kernel

• SCSI controller or IDE chipset support is either not compiled or is compiled as a module instead of initrd

• File system support is either not compiled or is compiled as a module instead of initrd

• If you have recently installed the system, then the odds are that you haven’t edited /etc/fstab file while installing. fstab is the file referenced by Linux to determine available disks and disk partitions and is most commonly used by mount command.

Solution

To solve such issues, you need to boot your affected system using Linux Live CD and check and reset the faulty parameters that are preventing your Linux system from booting. If this doesn’t help, you should reformat and reinstall the system as the last resort. You can then restore your lost data from the most recent data backup you have. But backup availability is not must in each case. In such situations, you are recommended to use Linux Recovery software.

Linux Data Recovery applications are advanced applications that are specifically designed to scan a logically crashed drive. After a thorough scan, they restore lost data at a safe location, without harming actual data.

Stellar Phoenix Linux Data Recovery is a powerful Data Recovery Linux software that supports Ext2, Ext3 and ReiserFS file systems. It is a non-destructive tool with rich user interface and advanced recovery abilities. It natively supports all Linux distributions like Red Hat, Turbo Linux, SlackWare, Caldera, Sorcerer, SUSE etc.

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When you boot a Linux based system, the first thing that occurs is initialization of your hardware. After this, the Grub boot loader loads from MBR (Master Boot Record) of hard drive based on its configuration. You might see a boot menu displaying all the operating systems in a list from which you can start the system or the kernel initializing. If you don’t observer any such behavior, the problem is likely to be related to Grub or MBR. In critical situations, you might need to reformat the hard drive and restore lost data from backup. But in case no backup is available or you find it in invalid state, Linux Recovery tools can help rescuing all the data from crashed hard drive.

As an example, after you install Windows in dual-boot with Linux, you might fail to boot into Linux.

Cause

Such kind of behavior might be seen if MBR gets overwritten. This doesn’t allow you to boot into Linux.

Solution

You should try these methods to solve this problem:

• Try booting your system using Linux installation CD. Enter the ‘Linux rescue’ and use this command at boot prompt:

root=/dev/hdXX

where, ‘hdXX’ is the boot partition of your hard disk.

• Boot your system using Live Distro disc and mount the root partition of your hard disk to a temporary boot point. Next, you need to change your root to this point and reinstall Grub. To do so, you need to apply these commands in order:

mkdir /mnt/temp

mount /dev/hdb1 /mnt/temp

chroot /mnt/temp

grub-install /dev/had

• If the above measures fail, you should reformat the hard drive to fix all MBR related problems. Next, you should make sure that you have complete backup to restore the lost information in this process. If you fail to do so, you can use third-party Linux Recovery tools. Built with powerful recovery technology, such Linux Recovery applications serve as efficient tools to recover lost data. In addition, they provide you interactive user interface and advanced recovery options for complete results.

Stellar Phoenix Linux Data Recovery is a fast and comprehensive recovery tool for lost/deleted data from Linux based drives. It natively supports Ext2, Ext3 and ReiserFS file systems. It provides you advanced features like File Filter, File Mask, Create Image, RAW File Recovery and more. It is compatible with most of the Linux distros like Red Hat, Gentoo, SUSE, SlackWare, Debian etc.

In Linux operating system, myrescue is an utility to retrieve still-readable information from damaged hard drive. This Linux Data Recovery tool is similar to the dd_rescue, however it attempts to quickly get out of corrupted area to handle undamaged part first. After extracting data from the undamaged area, the utility then returns to the damaged area and tries to fix it.

The myrescue utility attempts to copy your hard drive block-wise to the file and creates a block bitmap (table) remarking whether the block is successfully copied, not handled yet or it has errors. The block bitmap or table can be employed in the successive runs for concentrating on unresolved blocks.  

This Data Recovery Linux utility effectively handles the read errors, through its special skip way. General the hard drive surface blemishes cover more than simply one data block and uninterrupted reading data from the defected areas may damage the hard drive surface, the hard drive mechanisms, and read/write heads.

When it occurs, the possibilities of retrieving the remaining and undamaged data decreased dramatically. Therefore in the skip mode of myrescue, it attempts to escape the damaged area quickly by exponentially incrementing the step size. It marks the skipped blocks as un-handled in block bitmap table and they may be retrieved at later stage.

Ultimately, the utility has an advanced option to multiply attempt for reading data from a data block, before believing it is damaged.

However, you should bear in mind that the this utility is not a replacement for third-party data recovery utilities. When you have a second option, do not even try to use myrescue, as the tool may cause more damage to your hard drive.

The myrescue utility is available only for the situation that you’re completely desperate and cannot afford any professional Linux Recovery utility. If your data is highly significant for your business, it is worth to go for professional recovery applications.

The Linux Data Recovery software are able to handle all types of data loss situations, ranging from simple deletion to the most severe file system corruption. The applications carry out in-depth scan of entire Linux hard drive and extract all lost, missing, and inaccessible data from it. The come equipped with simple and rich graphical user interface, to allow you to carry out Do It Yourself recovery.

Stellar Phoenix Linux Data Recovery is the most familiar and powerful program that ensures absolute recovery of all your lost data. The software recovers data from Ext4, Ext3, Ext2, FAT12, FAT16, and FAT 32 file system volumes. It is compatible with all major distributions of Linux operating systems including SUSE, Debian, Red Hat, and Fedora.

The native partition type code used by a Linux hard drive is 0×83 irrespective of the file system (ext2, ext3, reiserfs etc.). When you partition your hard drive using fdisk or any other utility, it often consists of two partitions: a root directory partition (denoted as ‘/’) and a swap partition. A partition table is the index table that references all Linux hard drive partitions. So, if this table gets corrupt, the system couldn’t locate and thus access the partitions. In such situations, you need to use your recent data backup and restore lost information from it. However, if data backup is non-existent, invalid or not updated, Linux Data Recovery tools can be used to scan the affected hard drive.

Consider a scenario, you start your Linux system and it displays the following error message:

“The partition table on device <drive_name> was unreadable”

Cause

The partition table is corrupted or damaged. It can get corrupt due to unexpected shutdown, incorrect installation of updates, improper use of terminal commands, erroneous use of disk partitioning utilities, partition resizing and other similar causes.

Solution

To correct this issue, you need to carry out these steps:

You need to ensure that at least one of the partitions has been marked as Active

If you can boot the operating system, you should immediately backup all the important data

Next, you need to delete all the existing partitions and then recreate them. To accomplish the same, you can use fdisk or any other disk partitioning utility

Repartitioning the hard disk erases all the previously stored data. So, you need to use your recent data backup to restore it. If the data backup is not present or up to the mark, you need to scan your hard drive using Linux Recovery tools to extract the lost data.

Linux Data Recovery applications incorporate advanced scanning procedures to recover and restore the lost data. With elf-explanatory interface, these utilities provide easy recovery. In addition, these recovery software are read-only tools and hence they don’t perform any write operation. You can use these tools in any logical data loss case.

Stellar Phoenix Linux Data Recovery is efficient Linux Recovery tool. The software supports advanced recovery features and provides effective recovery results. It is a read-only tool that supports Ext2, Ext3 and ReiserFS file systems. This  Linux Data Recovery tools is compatible with almost all Linux distributions like Gentoo, Turbo Linux, SlackWare, SUSE etc.